Does it pay to retrieve stored food items in sequence?

Article Abstract:

Most hoarding animals store more food than they need and their main problem is to reduce the energy costs of retrieving the stored items. To achieve this, animals should retrieve food in reversed order. A model of storage and retrieval that uses the reversed-retrieval strategy is described and compared with a random-order strategy. It is shown that the reversed-retrieval model achieves more retrieved food than the random strategy.

Evolution of sex differences in microhabitat choice and colour polymorphism in Idotea baltica

Article Abstract:

A study was conducted on the color polymorphism and sex differences in microhabitat selection in the marine isopod Idotea baltica. In visually identical microhabitats, there was no observed color-morph-dependent preference. Results also reveal that a specific Fucus property is responsible for microhabitat preference of the sexes. Furthermore, sex differences in microhabitat selection is attributed to adaptation for reproductive success.